Investigative journalists Mariana van Zeller and Darren Foster explore the synthetic drug craze in America. They travel to the South, where local law enforcement is trying to shut down manufacturers and distributors - a difficult task, because the chemicals used are constantly changing and the law cannot keep up. They go undercover with Marines in San Diego to local smoke shops to see how easy it is for someone to buy synthetic marijuana and bath salts.

One year after the Newtown, Connecticut, and Aurora, Colorado, mass shootings, the gun control debate has dominated national headlines. Mariana Van Zeller and Darren Foster visit a gun enthusiast community in Arizona, a state with some of the most permissive gun laws in America. In dramatic hidden-camera footage, Van Zeller and a private investigator purchase an AK-47 assault rifle in a fast food parking lot within an hour of making contact with the seller.

Mariana van Zeller and Darren Foster explore the world of sex trafficking, going undercover at America's prostitution tracks and illegal massage parlors, and coming face to face with the traffickers themselves.

Van Zeller and Foster explore the debate between the animal agricultural industry and the animal rights movement.

Mariana van Zeller and Darren Foster journey to some of the country's most haunted locations and examine America's obsession with the paranormal.

In this episode, investigative journalists Mariana van Zeller and Darren Foster explore firsthand the little-seen world of America's homeless youth.